Chair



FIG. 1 is a front-right side perspective view of a chair showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a left side perspective view thereof, the right side perspective view being a mirror image thereof; and,

FIG. 4 is a top view thereof.

The unshown rear side and underside of the chair form no part of the claimed design. 

The ornamental design for a chair, as shown and described. 